lib/ExecutionEngine/Orc/JITTargetMachineBuilder.cpp

   1 //===----- JITTargetMachineBuilder.cpp - Build TargetMachines for JIT -----===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/ExecutionEngine/Orc/JITTargetMachineBuilder.h"
  10
  11 #include "llvm/Support/Host.h"
  12 #include "llvm/Support/TargetRegistry.h"
  13
  14 namespace llvm {
  15 namespace orc {
  16
  17 JITTargetMachineBuilder::JITTargetMachineBuilder(Triple TT)
  18     : TT(std::move(TT)) {
  19   Options.EmulatedTLS = true;
  20   Options.ExplicitEmulatedTLS = true;
  21 }
  22
  23 Expected<JITTargetMachineBuilder> JITTargetMachineBuilder::detectHost() {
  24   // FIXME: getProcessTriple is bogus. It returns the host LLVM was compiled on,
  25   //        rather than a valid triple for the current process.
  26   JITTargetMachineBuilder TMBuilder((Triple(sys::getProcessTriple())));
  27
  28   // Retrieve host CPU name and sub-target features and add them to builder.
  29   // Relocation model, code model and codegen opt level are kept to default
  30   // values.
  31   llvm::SubtargetFeatures SubtargetFeatures;
  32   llvm::StringMap<bool> FeatureMap;
  33   llvm::sys::getHostCPUFeatures(FeatureMap);
  34   for (auto &Feature : FeatureMap)
  35     SubtargetFeatures.AddFeature(Feature.first(), Feature.second);
  36
  37   TMBuilder.setCPU(llvm::sys::getHostCPUName());
  38   TMBuilder.addFeatures(SubtargetFeatures.getFeatures());
  39
  40   return TMBuilder;
  41 }
  42
  43 Expected<std::unique_ptr<TargetMachine>>
  44 JITTargetMachineBuilder::createTargetMachine() {
  45
  46   std::string ErrMsg;
  47   auto *TheTarget = TargetRegistry::lookupTarget(TT.getTriple(), ErrMsg);
  48   if (!TheTarget)
  49     return make_error<StringError>(std::move(ErrMsg), inconvertibleErrorCode());
  50
  51   auto *TM =
  52       TheTarget->createTargetMachine(TT.getTriple(), CPU, Features.getString(),
  53                                      Options, RM, CM, OptLevel, /*JIT*/ true);
  54   if (!TM)
  55     return make_error<StringError>("Could not allocate target machine",
  56                                    inconvertibleErrorCode());
  57
  58   return std::unique_ptr<TargetMachine>(TM);
  59 }
  60
  61 JITTargetMachineBuilder &JITTargetMachineBuilder::addFeatures(
  62     const std::vector<std::string> &FeatureVec) {
  63   for (const auto &F : FeatureVec)
  64     Features.AddFeature(F);
  65   return *this;
  66 }
  67
  68 } // End namespace orc.
  69 } // End namespace llvm.